private async Task<DialogTurnResult> LeaveDateRangeStepAsync(WaterfallStepContext stepContext, CancellationToken cancellationToken)
    {
        var leaveApply = (LeaveApplication)stepContext.Options;

        if (leaveApply.TravelDate == null)
        {
            return await stepContext.PromptAsync(nameof(TextPrompt), new PromptOptions { Prompt = MessageFactory.Text("Please Provide me with your Leaves Tenure") }, cancellationToken);
        }
        else
        {
            return await stepContext.NextAsync(leaveApply.TravelDate, cancellationToken);
        }
    }

if (topIntent == "LeavesDateTenure")
            {   // here i want my dialog to work


            }